Distance from the Atlantic, 2408 miles; current, 3-1/4 miles per hour.
MOUTH OF THE HUALLAGA RIVER.
Distance from the Atlantic, 2430 miles; current in Amazon, 3-1/4 miles per hour. One hundred and twenty-three miles up the Huallaga is the town of Yurimaguas, a centre of trade, to which steamers from Para frequently ascend.
CEDRO ISLA.
Distant from the Atlantic 2445 miles; current, 3-1/4 miles per hour.
MOUTH OF THE PASTAGA RIVER.
Distance from the Atlantic, 2514 miles; current in the Amazon, 3-1/4 miles per hour. The Pastaga has a rapid current and is full of obstructions to navigation; it is with much difficulty that canoes even can be forced up the river for any distance. On its head waters the Indians wash a considerable quantity of gold from the sand of the bed of the channel.
BARRANCA.
Latitude, 4° 59' 53" south; longitude, 76° 38' 38" west of Greenwich; magnetic variation, 7° 46' 26" east; thermometer, 78°; elevation above sea-level, 453 feet; distance from the Atlantic, 2545 miles; current, 3-1/4 miles per hour. Barranca is situated on a red clay bluff, about seventy feet high, on the north or left bank of the river, which is here narrow. Communication is kept up between Barranca and Moyabamba by way of the Aypena river to its head and thence by land. Barranca has been used as, but is not well adapted to be, a military post; gunboats could lay out of sight below, around a bend of the river, and shell it without being themselves exposed to its fire.